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Expression of the transcriptional activator LAC9 (KlGAL4) in Kluyveromyces lactis is controlled by autoregulation.

机译:转录激活因子LAC9(KlGAL4)在乳酸克鲁维酵母中的表达通过自动调节来控制。

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摘要

The concentration of the transcriptional activator LAC9 (KlGAL4) of Kluyveromyces lactis is moderately regulated by the carbon source as is the case for GAL4, its homolog in Saccharomyces cerevisiae. Expression of the LAC9 gene is induced about twofold in galactose. This induction is due to autoregulation. The LAC9 gene product binds to a low-affinity binding site in the LAC9 promoter and moderately activates transcription in response to galactose above a basal level. As for the LAC9-controlled metabolic genes, induction of LAC9 is inhibited in the presence of glucose. This inhibition of induction is a prerequisite for glucose repression of the lactose-galactose metabolic pathway. On the other hand, induced LAC9 levels are required for optimal growth on galactose, since mutating the LAC9 binding site in the LAC9 promoter resulted in poor growth and reduced expression of LAC9-controlled genes. Thus, in addition to the GAL80-dependent regulation by protein-protein interaction, the regulation of LAC9 gene expression is an important parameter in determining carbon source control of the LAC-GAL regulon. Although the mode of control is different, the pattern of LAC9 gene regulation resembles that of the S. cerevisiae GAL4 gene, being lower in glucose and glucose-galactose than in galactose.
机译:乳酸克鲁维酵母的转录激活因子LAC9(KlGAL4)的浓度受到碳源的适度调节,GAL4是酿酒酵母的同系物。在半乳糖中诱导LAC9基因的表达约两倍。这种感应归因于自动调节。 LAC9基因产物与LAC9启动子中的低亲和力结合位点结合,并响应于高于基础水平的半乳糖适度激活转录。至于LAC9控制的代谢基因,在葡萄糖存在下,LAC9的诱导被抑制。诱导的这种抑制是葡萄糖抑制乳糖-半乳糖代谢途径的先决条件。另一方面,诱导的LAC9水平是在半乳糖上最佳生长所必需的,因为突变LAC9启动子中的LAC9结合位点会导致生长缓慢和LAC9控制基因的表达降低。因此,除了通过蛋白质-蛋白质相互作用的GAL80依赖性调节之外,LAC9基因表达的调节是确定LAC-GAL调节子的碳源控制的重要参数。尽管控制方式不同,但LAC9基因的调控方式与酿酒酵母GAL4基因的调控方式相似,葡萄糖和葡萄糖-半乳糖的含量低于半乳糖。

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